9 Electric welding apparatus, in particular electric welding apparatus for plastic packaging, in particular electric foil sealing apparatus for plastic welding foils, namely, heat sealing machines; electric plastic welding apparatus, in particular for sealing plastic containers through welding, namely, heat sealing machines; electric foil sealing apparatus, in particular for sealing sterile goods packaging, namely, heat sealing machines; electric foil sealing apparatus with vacuum function, in particular for sealing and vacuuming plastic packaging foils, namely, heat sealing machines